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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a conventional edgeless
speaker. FIG. 1 is a longitudinal cross-sectional view of a schematic main part of the conventional
edgeless speaker, and FIGS. 2 and 3 are main portions for explaining the edgeless speaker
according to the present invention. FIG. 1 is a speaker frame, 5 is an air gap, 6 is a composite
diaphragm, 6a and 6a 'are core members, 6bU skin, and 7 is an adhesive.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an edgeless
speaker, and in particular, an improvement of its vibration characteristics. For example, in the
case of a conventional cone-shaped speaker, flexible diaphragms are attached to the peripheral
edge portions of various sheets (pulp paper, plastic, special fiber cloth, non-ferrous metal strips,
etc.) formed in a cone shape. The frame is supported by the frame. However, such edge members
cause large disturbances in the frequency characteristics of the speaker, and therefore, the sound
quality is also adversely affected). As an alternative model, the edgeless speaker as shown in FIG.
(11 f no /, f-one) / one. In the figure, (11 is a frame, (2) is a diaphragm made of a sheet as
described above, (3) is a center cap, and (4) is an annular reinforcing member joined to the outer
periphery of the moving plate (2) , And a uniform gap t51 is provided between the reinforcing
member +41 and the inner periphery of the frame tll so as to obtain an acoustic impedance of
the value. By the way, although the acoustic impedance due to the above-mentioned gap (5) is
indispensable for rounding to secure the low region, in practice, it is necessary to make the
length considerably (the length must be made quite large. And the clearance C needs to be set as
small as possible. In this case, clearance C? If it is too small, contact between the inner periphery
of the frame (1) and the reinforcing member + 41 is likely to occur due to the inclination or
eccentricity of the imaging moving plate (2). It is believed that the combing method is
advantageous. However, if B-longer, the reinforcement member 54j will inevitably increase its
mass, and ■ US as a moving plate of the moving picture plate (2), the division into 4 parts will
greatly affect the reflection of T from the speaker Significantly reduce custom orders. 12 + This
invention is made by looking at the point on the board, and it is to adopt the plywood plywood as
the diaphragm of the edgeless speaker, and try not to solve the defects of the secondary cutting.
An embodiment of the invention will now be described with reference to FIGS. 2 and 3. Fig. 2 is
an endless speaker according to the present invention! ! (1) is a frame, (6) is a cone-shaped
composite diaphragm disposed in the inside, and the composite diaphragm (6) of this example is
a core material made of foamed plastic or the like (6a) is a composite plate in which the skin (6b)
(aluminum foil, beryllium foil, titanium foil, carbon fiber, other various sheets) t-deposited
composite plate is used, and such a composite diaphragm (6) It is already known.
That is, this is based on the intention of improving the flexural rigidity of the diaphragm to
improve the frequency characteristics of the speaker (in the case of woo 7.-., High range in the
case of woo 7.-. Being able to exert the effect of di (d widely accepted. A diaphragm using a
honeycomb slope as a core material is also known. In the present invention, for example, a cone
shape as shown (I! (1) A rubber or resin adhesive mixed with a glass balloon (an adhesive that
can be foamed by heating, chemical treatment, etc.) (7 j is applied in a filling manner to the end
face of the edge portion, and the end face portion is joined and shaped, A uniform gap (empty 1!)
Between the inner peripheral surface of the frame + 11 and the peripheral end face of the
composite diaphragm + 61 J) separate 15+ so that the required acoustic impedance is obtained.
That is, such a composite diaphragm (6) has a small mass as a whole, and its thickness is
approximately IQ mm, and its bending rigidity is sufficiently large. The space between the inner
surface of 7 runes il + and the inner surface of the frame fil can be combined with the inner
surface of the frame fil when it is driven. There is no concern that contact with the peripheral
end face of the diaphragm 161 occurs, and the excellent characteristics of the edgeless speaker
are exhibited. Figure 113 is a longitudinal cross-sectional view showing the main part of the
previous example by applying the present invention to an edgeless speaker with a thousand plate
size, and in this case (the core material (6a) of the 4J flat composite diaphragm (6) is a
honeycomb slope) The same bonding and shaping processing as in the previous example is
applied to the end face of the peripheral portion. The parts corresponding to those in FIG. Thus,
the present invention solves the drawbacks of the conventional loudspeakers by forming the
diaphragm-tube composite plate of the edgeless loudspeaker, and the above-mentioned excellent
characteristics of the composite diaphragm itself and the above-mentioned combination are
combined. Because the effect as an edgeless can be further improved, the profit is great.